The government needs to find out about a rock made of the rare and powerful element - jerranium 90. They seek out the man who has extensive knowledge of rocks - Dr. Paul Armstrong. They discover from Dr. Armstrong s wife Betty that he has disappeared deep into the Amazon jungle. Meanwhile, another group financed by Handscombe Draile has travelled to South America with their own sinister agenda regarding this rock. Peter Fleming, twin brother of deceased evil scientist Dr. Roger Fleming, becomes possessed by a skull found in his late brother s belongings. The skull, all that remains of the titular Lost Skeleton of Cadavra, tells Peter that he must find the sacred Dalp of Anacrabb. Only this mysterious totem can bring the Lost Skeleton back to full power - and full body.